• Actor Neil Patrick Harris and David Burtka have 6-year-old twins named Harper and Gideon. • Every Halloween, they dress up in incredible family costumes. • They finally revealed their 2016 costume: Legendary Hollywood actors.

Ever since he and husband David Burkta welcomed twins Harper and Gideon in 2010, the family has built a reputation for dressing in adorable ensemble costumes every October.

The actor briefly addressed his family's Halloween dominance during a recent appearance on "Late Night with Seth Meyers." Meyers opened the conversation by saying: "It seems to me that you take Halloween very seriously."

"You don't
?" Harris replied, incredulous.

Take a look at every costume the family has worn over the years — you'll see exactly what he means.

In 2011, when the twins had just turned 1, they were Peter Pan, Tinkerbell, Smee, and Captain Hook.

The next year, Harper was Dorothy while the boys dressed as her sidekicks: the Tin Man, the Scarecrow, and the Cowardly Lion.

In 2013, they created two family costumes. The first was "Alice In Wonderland"-themed:

The second was all about Halloween classics: Frankenstein's monster, a werewolf, Frankenstein's bride, and Dracula.

In 2014, they tried out superhero and villain looks: The kids were Batman and Batgirl and the parents were the Joker and the Riddler.

Last year, they must have been excited about the impending release of the next "Star Wars" film: Harris and Burtka went as Obi-Wan Kenobi and Han Solo, while the twins went as Luke and Leia Skywalker (the characters are twins, too!).

And on Monday afternoon, Harris finally announced the family's 2016 costume on Instagram. This time around, they dressed up as Hollywood legends: Groucho Marx, Charlie Chaplin, Marilyn Monroe, and James Dean. And they look adorable, as usual.